Welding helmet



FIG. 1 is a perspective view of a welding helmet showing our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a left side elevation view thereof, the right side being a mirror image; and,

FIG. 4 is a top plan view thereof.

The broken lines depict portions of the design that form no part of the claim. Sides of the welding helmet design that are not shown form no part of the claim. 

The ornamental design for a welding helmet, as shown and described. 